WO2015176504A1 - 一种选择小区的方法及用户设备和计算机存储介质 - Google Patents

一种选择小区的方法及用户设备和计算机存储介质 Download PDF

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Publication number
WO2015176504A1
WO2015176504A1 PCT/CN2014/091038 CN2014091038W WO2015176504A1 WO 2015176504 A1 WO2015176504 A1 WO 2015176504A1 CN 2014091038 W CN2014091038 W CN 2014091038W WO 2015176504 A1 WO2015176504 A1 WO 2015176504A1
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timer
cell
neighboring cell
available frequency
frequency point
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PCT/CN2014/091038
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English (en)
French (fr)
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潘磊
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深圳市中兴微电子技术有限公司
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Publication of WO2015176504A1 publication Critical patent/WO2015176504A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method for selecting a cell, a user equipment, and a computer storage medium. .
  • LTE Long Term Evolution
  • UE user equipment
  • the UE is in the connected state and is performing a data service.
  • the physical layer PHY, Physical Layer
  • the physical layer detects the link out of synchronization due to various external reasons, and reports it to the upper layer radio resource control layer (RRC, Radio). Resource Control).
  • RRC Radio Resource Control
  • the RRC starts the T310 timer and waits for the physical layer to synchronize the recovery link.
  • the T310 times out if the physical layer fails to synchronize the uplink, the UE starts the re-establishment process.
  • the T311 timer is enabled. If the UE does not find a suitable cell to camp before the T311 timer expires, the reconstruction will fail. Therefore, when a UE with a relatively large number of supported frequency bands performs reconstruction, since it takes a long time to perform full-band frequency sweeping, and it will greatly exceed the duration of the T311 timer, then there are UEs with more supported frequency bands. Rebuilding technical problems that are prone to failure.
  • the embodiment of the present invention is to provide a method for selecting a cell, a user equipment, and a computer storage medium, so as to improve reliability of user equipment reconstruction with more supported frequency bands, so that The business can recover quickly.
  • the embodiment of the present invention provides a method for selecting a cell, where the method includes: starting a first timer; determining whether neighboring cell information of a neighboring cell is pre-stored in the user equipment; The area information, according to the neighboring area information, attempts to camp on the neighboring cell; if it is determined that the neighboring area information is not stored, initiate a frequency sweep to obtain a preset number of available frequency points, and try to Residing on the cell corresponding to the available frequency point; when the neighboring cell or the cell corresponding to the available frequency point is successfully camped, and the first timer does not time out, the first timer is turned off.
  • the method further includes: when a camping failure on the neighboring cell, initiating a frequency sweep, obtaining the available frequency point, and Attempts to camp on the cell corresponding to the available frequency point.
  • the initiating frequency sweeping, obtaining a preset number of available frequency points, and attempting to camp on the cell corresponding to the available frequency point includes: sweeping from the beginning of the frequency band, until obtaining the available frequency point Recording a starting frequency point in the available frequency points; performing a cell search on the starting frequency point, attempting to camp on the searched cell.
  • the first timer when the camping succeeds on the cell corresponding to the neighboring cell or the available frequency point, and the first timer does not time out, the first timer is closed, including: when When the neighboring cell or the cell corresponding to the available frequency point is successfully camped, the timing state of the first timer is obtained; when the timing state indicates that the first timer has not timed out, the The first timer.
  • the opening the first timer includes: when the user equipment detects that the link is out of synchronization, turning on the second timer, waiting for the link to resume synchronization; when the second timer expires The first timer is turned on.
  • a user equipment is included in the embodiment of the present invention, where the user equipment includes: a control list And a determining unit, configured to enable the first timer; and configured to reside on a cell corresponding to the neighboring cell or a preset number of available frequency points If the first timer is not timed out, the first timer is disabled; the determining unit is configured to determine whether neighboring cell information of the neighboring cell is pre-stored in the user equipment; The frequency sweeping unit is configured to: if it is determined that the neighboring area information is not stored, initiate a frequency sweep to obtain the available frequency point; and the resident unit is configured to determine, if the neighboring area information is stored, according to the neighboring area Zone information, attempting to camp on the neighboring cell; also configured to attempt to camp on the cell corresponding to the available frequency point.
  • the camping unit is further configured to: when the camping fails on the neighboring cell, initiate a frequency sweep, obtain the available frequency point, and try to camp on the cell corresponding to the available frequency point. .
  • the frequency sweeping unit is configured to start frequency sweeping from the beginning of the frequency band until the available frequency point is obtained, and record the starting frequency point in the available frequency point;
  • the user equipment further includes: a cell search unit And configured to perform a cell search on the starting frequency point;
  • the camping unit is further configured to try to camp on the searched cell.
  • control unit is configured to obtain a timing state of the first timer when the neighboring cell or the cell corresponding to the available frequency point is successfully camped; when the timing state indicates When the first timer does not time out, the first timer is turned off.
  • the control unit is configured to: when the user equipment detects that the link is out of synchronization, start a second timer, wait for the link to resume synchronization; when the second timer expires, open the The first timer is described.
  • an embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used in at least one of the methods of the first aspect.
  • the method for selecting a cell and the user equipment and the computer storage medium provided by the embodiment of the present invention, after the UE starts the first timer, determines whether the neighboring cell information of the neighboring cell is pre-stored, if any, according to the neighboring cell. Information, the UE is controlled to try to camp on the neighboring cell. When the camping on the neighboring cell is successful, and the first timer does not time out, the first timer is turned off; if not, the frequency sweep is initiated to obtain the preset number. The available frequency point is attempted to camp on the cell corresponding to the available frequency point. When the cell is successfully camped on the cell corresponding to the available frequency point and the first timer has not timed out, the first timer is turned off.
  • the UE may not need to perform full-band scanning, but preferentially select neighboring cells to camp, thus greatly shortening the selected cell for UEs with more supported frequency bands.
  • the elapsed time enables the UE to quickly select and camp on a suitable cell before the first timer, such as the T311 timer expires. If the neighboring area information of the neighboring cell is not pre-stored in the UE or the camping fails on the neighboring cell, the preset number of available frequency points is searched from the beginning of the frequency band, which is equivalent to sacrificing the optimized signal quality. In exchange for the real-time nature of the selected cell.
  • the above two methods reduce the risk of rebuilding failure due to timeout, effectively solve the technical problem that the UEs with more supported frequency bands are more likely to fail in the prior art, and improve the reliability of UE reconstruction with more supported frequency bands. , enabling the business to recover quickly and greatly enhance the user experience.
  • FIG. 1 is a schematic flowchart of a method for selecting a cell according to an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of a re-establishment process according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a user equipment provided in an embodiment of the present invention.
  • An embodiment of the present invention provides a method for selecting a cell, where the method is applied to a UE, and the UE may be a device such as a smart phone, a tablet computer, a smart TV, or a multimedia player.
  • FIG. 1 is a schematic flowchart of a method for selecting a cell according to an embodiment of the present invention. Referring to FIG. 1, the method includes:
  • the S101 may include: when the UE detects that the link is out of synchronization, the second timer is started, and the link is synchronized; when the second timer expires, the first timer is started.
  • the first timer may be a T311 timer in the LTE system
  • the second timer may be a T310 timer in the LTE system.
  • the PHY detects that the link is out of synchronization and reports the result to the RRC.
  • the RRC starts the second timer and waits for the link to be restored. Synchronize.
  • the RRC shuts down the second timer when the link is restored. Therefore, when the second timer expires, the link fails to resume synchronization.
  • the UE starts the first timer and simultaneously suspends the data service.
  • the operation of the radio bearer (RB, Radio Bear) and the reset medium access control layer (MAC, Media Access Control) is ready to initiate the re-establishment process.
  • S102 Determine whether the neighboring cell information of the neighboring cell is pre-stored in the user equipment.
  • the UE may determine whether the neighboring area information is pre-stored by querying in the storage unit or by searching for a measurement report.
  • the neighboring area information mentioned here may be information such as a broadcast control channel (BCCH, Broadcast Control CHannel) carrier frequency of a neighboring cell, a cell ID of a neighboring cell, and the like.
  • BCCH Broadcast Control CHannel
  • the UE determines that the neighbor information is stored in advance, the UE attempts to camp on the neighboring cell according to the information. Generally, the UE can quickly camp on the neighboring cell, and after the camping is successful, the UE can quickly complete the re-establishment process, so that the data service can be quickly recovered.
  • S104 may be: performing frequency sweeping from the beginning of the frequency band until a preset number of available frequency points are obtained, and recording a starting frequency point in the available frequency points; performing cell search on the starting frequency point, and attempting Resident on the searched cell.
  • the starting point of the frequency band mentioned herein is the starting point of multiple frequency bands supported by the UE, and may be a frequency band with a lower frequency value among the frequency bands, or a frequency band with a higher frequency value among the frequency bands. Make specific limits.
  • the preset number of available frequency points may be 1, 2, 10, 50, etc., depending on the actual UE situation, and a compromise between the delay and the cell quality is selected as much as possible. Set the preset number to 1 if you want the shortest delay.
  • the UE sweeps from the beginning of the frequency band until the 5 available frequency points are swept, and the frequency sweep ends.
  • the five available frequency points are: frequency point a, frequency point b, frequency point c, frequency point d, frequency point e.
  • the UE records the frequency point a, which is the smallest frequency value among the five frequency points, that is, the start point. Frequency.
  • the starting frequency point may also take the frequency point e with the largest frequency value among the above five frequency points, and may also take the frequency point with the strongest signal strength as the starting frequency point, which is not specifically limited in the present invention.
  • the UE After the UE records the starting frequency point, the UE performs a cell search on the starting frequency point, performs measurement on the searched cell, and performs a camping condition judgment on the cell according to the measurement result, if the camping condition If the UE is satisfied, the UE camps on the cell. If the camping condition is not met, the UE continues to search for the next cell.
  • the UE determines whether the cell is suitable for camping according to the following conditions.
  • RSRP Cell Reference Signal Received Power
  • the cell belongs to the equivalent PLMN list stored in the public land mobile network (PLMN, Public Land Mobile Network) selected by the non-access stratum, the registered PLMN or the universal SIM card.
  • PLMN public land mobile network
  • PLMN Public Land Mobile Network
  • the cell is not a prohibited cell
  • the tracking area (TA, Tracking Area) to which the cell belongs does not belong to any one of the prohibited TA lists of the PLMN to which the cell belongs;
  • the cell can satisfy the normal camping condition, and the UE can camp on such a cell to obtain normal service.
  • the process ends, the UE returns to the idle state, and the data service is terminated.
  • the UE camping on the neighboring cell through S103 may fail to camp because the camping condition is not satisfied.
  • the method may further include: when the camping fails on the neighboring cell, The sweep is initiated, the available frequency points are obtained, and an attempt is made to camp on the cell corresponding to the available frequency point. That is to say, after the UE fails to camp in the neighboring cell, the UE can also obtain a preset number of available frequency points by sweeping, and further perform cell search and try to camp, so that the optimization signal is sacrificed. Quality, in exchange for the real-time nature of the selected cell.
  • the UE needs to determine the first timing when the UE successfully camps on the cell corresponding to the neighboring cell or the available frequency point. If the T311 timer expires, the UE can obtain the timing status of the first timer, for example, obtain the current value of the T311 timer. If the value is 0, it determines that the T311 timer expires. If the number is not 0, It is determined that the T311 timer has not timed out. Then, when it is determined that the first timer has not timed out, the first timer is turned off. When it is determined that the first timer expires, the resource is released, the process ends, the UE returns to the idle state, and the data service is terminated.
  • the UE completes the process of cell selection, and the UE can start a third timer, such as LTE.
  • the T301 timer in the system sends a re-establishment request to the network side on the cell where it resides.
  • the network side After receiving the re-establishment request, the network side sends a re-establishment response to the UE, and the UE receives the re-establishment response from the network side, and closes the third.
  • the timer is configured, the UE completes the re-establishment completion message.
  • the UE is successfully re-established.
  • the network side re-allocates the service resources, the UE can continue to perform services.
  • FIG. 2 is a schematic diagram of a re-establishment process according to an embodiment of the present invention. Referring to FIG. 2, the re-establishment process is:
  • S202 The RRC starts the T310 timer, and waits for the link to resume synchronization.
  • RRC determines whether the neighboring cell information of the neighboring cell is stored in advance; if it is determined that the neighboring cell information is stored, the process proceeds to S205; if it is determined that the neighboring cell information is not stored, the process proceeds to S207;
  • S205 RRC attempts to camp on the neighboring cell according to the neighboring cell information; if the camping is successful, skip to S206; if the camping is unsuccessful, skip to S207;
  • the RRC obtains the timing status of the T311 timer to determine whether the T311 timer expires; if the timeout expires, the UE releases the resource, and the UE returns to the idle state, and the process ends; if not, the process goes to S210;
  • S207 The RRC starts from the beginning of the frequency band, and initiates a frequency sweep according to the preset number N; if the available frequency point is found, the process jumps to S208; if the available frequency point is not found, the T311 timer is turned off, the UE returns to the idle state, and the service is terminated. End;
  • RRC performs cell search on the initial frequency point, and attempts to camp on the searched cell; if the resident is successful, skips to S206; if the resident is unsuccessful, skips to S207;
  • the RRC turns off the T311 timer, and initiates a reestablishment request to the network side on the camped cell.
  • the RRC receives the reestablishment response sent by the network side, and performs related configuration.
  • the neighboring cell in the process of searching for a cell after the out-of-synchronization, the neighboring cell preferably camps, and if the UE stores the neighboring cell information of the neighboring cell in advance, it can quickly camp on it. If the neighboring area information of the neighboring cell is not pre-stored in the UE or the camping fails on the neighboring cell, the preset number of available frequency points is searched from the beginning of the frequency band, which is equivalent to the sacrificial optimization signal. Quality, in exchange for the real-time nature of the selected cell.
  • the method for selecting a cell can reduce the reconstruction delay, thereby reducing the risk of failure of the reconstruction due to the timeout, and effectively solving the technical problem that the UE with more supported frequency bands in the prior art is prone to failure. Improve the reliability of UE reconstruction with more supported frequency bands, enabling the service to recover quickly and greatly improve the user experience.
  • FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment includes: a control unit 31, a determining unit 32, and a frequency sweeping.
  • the control unit 31 is configured to enable the first timer, and is configured to: when the neighboring cell or the cell corresponding to the available frequency point is successfully camped, and the first timer does not time out, the first timer is closed;
  • the unit 32 is configured to determine whether the neighboring cell information of the neighboring cell is pre-stored in the user equipment.
  • the frequency sweeping unit 33 is configured to: if it is determined that the neighboring cell information is not stored, initiate a frequency sweep to obtain an available frequency point; the resident unit 34 If it is determined that the neighboring area information is stored, try to camp on the neighboring cell according to the neighboring area information; and is configured to try to camp on the cell corresponding to the available frequency point.
  • the camping unit 34 is further configured to initiate a frequency sweep when the camping fails on the neighboring cell, obtain an available frequency point, and try to camp on the cell corresponding to the available frequency point.
  • the frequency sweeping unit 33 is configured to sweep from the beginning of the frequency band until the available frequency point is obtained, and record the starting frequency point in the available frequency point;
  • the user equipment further includes: a cell search unit, It is configured to perform a cell search on the starting frequency point; the camping unit 34 is also used to attempt to camp on the searched cell.
  • control unit 31 is configured to obtain a timing state of the first timer when the camping on the cell corresponding to the neighboring cell or the available frequency point is successful, and close when the timing state indicates that the first timer has not timed out. The first timer.
  • control unit 31 is configured to: when the user equipment detects that the link is out of synchronization, start the second timer, wait for the link to resume synchronization; when the second timer expires, start the first timer.
  • the control unit 31, the determining unit 32, the frequency sweeping unit 33, the camping unit 34 and the cell search unit described above may all be located in the processor of the user equipment, and each timer may be located in the processor of the user equipment,
  • the user equipment may further be located in a timer chip connected to the processor, and the user equipment further includes a memory configured to store neighboring area information of the neighboring cell.
  • the processor may be an application processor (AP) in a mobile device, a central processing unit (CPU), a digital signal processor (DSP), or Field Programmable Gate Array (FPGA).
  • AP application processor
  • CPU central processing unit
  • DSP digital signal processor
  • FPGA Field Programmable Gate Array
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute at least one of the methods in the embodiment, as shown in FIG. The method described.
  • the storage medium may be a storage medium such as a ROM, a RAM, a removable hard disk, a Flash, an optical disk, a DVD, or a mobile hard disk.
  • the storage medium may be a non-transitory storage medium.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the present invention may employ computer-usable storage media (including but not limited to disks) in one or more of the computer-usable program code embodied therein. A form of computer program product embodied on a memory and optical storage, etc.).
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本发明实施例公开了一种选择小区的方法，该方法应用于用户设备，所述方法包括：开启第一定时器；确定用户设备中是否预先存储有相邻小区的邻区信息；若确定存储有所述邻区信息，根据所述邻区信息，尝试在所述相邻小区上驻留；若确定未存储有所述邻区信息，发起扫频，获得预设数目的可用频点，并尝试在所述可用频点对应的小区上驻留；当在所述相邻小区或所述可用频点对应的小区上驻留成功，且所述第一定时器未超时时，关闭所述第一定时器。本发明还同时公开了一种用户设备和计算机存储介质。

Description

一种选择小区的方法及用户设备和计算机存储介质 技术领域
本发明涉及无线通信领域，尤其涉及一种选择小区的方法及用户设备和计算机存储介质。。
背景技术
目前，在长期演进(LTE，Long Term Evolution)系统中，用户设备(UE，User Equipment)在连接态进行业务的时候，通常在失步后会通过重建流程来恢复业务。
例如，UE处于连接态，正在进行一数据业务，此时，由于各种外部原因，导致物理层(PHY，Physical Layer)检测到链路失步，并上报给上层无线资源控制层(RRC，Radio Resource Control)。然后，RRC开启T310定时器，等待物理层同步恢复链路。当T310超时时，如果物理层未能同步上链路，UE开始发起重建流程。
在重建流程中，UE搜索合适的小区驻留时，会开启T311定时器，如果在T311定时器超时之前，UE还没有找到合适的小区驻留的话，重建就会失败。所以，当支持的频段比较多的UE进行重建时，由于其进行全频段扫频的耗时较长，很大概率地会超过T311定时器的时长，那么，就存在支持的频段较多的UE重建容易失败的技术问题。
发明内容
有鉴于此，本发明实施例期望提供一种选择小区的方法及用户设备和计算机存储介质，以提高支持的频段较多的用户设备重建的可靠性，使得 业务能够快速恢复。
本发明实施例的技术方案是这样实现的：
第一方面，本发明实施例提供一种选择小区的方法，所述方法包括：开启第一定时器；确定用户设备中是否预先存储有相邻小区的邻区信息；若确定存储有所述邻区信息，根据所述邻区信息，尝试在所述相邻小区上驻留；若确定未存储有所述邻区信息，发起扫频，获得预设数目的可用频点，并尝试在所述可用频点对应的小区上驻留；当在所述相邻小区或所述可用频点对应的小区上驻留成功，且所述第一定时器未超时时，关闭所述第一定时器。
基于上述方案，在所述尝试在所述相邻小区上驻留之后，所述方法还包括：当在所述相邻小区上驻留失败时，发起扫频，获得所述可用频点，并尝试在所述可用频点对应的小区上驻留。
基于上述方案，所述发起扫频，获得预设数目的可用频点，并尝试在所述可用频点对应的小区上驻留，包括：从频段起点开始扫频，直到获得所述可用频点，记录所述可用频点中的起始频点；在所述起始频点上进行小区搜索，尝试在搜索到的小区上驻留。
基于上述方案，所述当在所述相邻小区或所述可用频点对应的小区上驻留成功，且所述第一定时器未超时时，关闭所述第一定时器，包括：当在所述相邻小区或所述可用频点对应的小区上驻留成功时，获得所述第一定时器的定时状态；当所述定时状态表明所述第一定时器未超时时，关闭所述第一定时器。
基于上述方案，所述开启第一定时器，包括：当所述用户设备检测到链路失步时，开启第二定时器，等待所述链路恢复同步；当所述第二定时器超时时，开启所述第一定时器。
第二方面，本发明实施例一种用户设备，所述用户设备包括：控制单 元、确定单元、扫频单元及驻留单元；其中，所述控制单元，配置为开启第一定时器；还配置为当在相邻小区或预设数目的可用频点对应的小区上驻留成功，且所述第一定时器未超时时，关闭所述第一定时器；所述确定单元，配置为确定所述用户设备中是否预先存储有所述相邻小区的邻区信息；所述扫频单元，配置为若确定未存储有所述邻区信息，发起扫频，获得所述可用频点；所述驻留单元，配置为若确定存储有所述邻区信息，根据所述邻区信息，尝试在所述相邻小区上驻留；还配置为尝试在所述可用频点对应的小区上驻留。
基于上述方案，所述驻留单元，还配置为当在所述相邻小区上驻留失败时，发起扫频，获得所述可用频点，尝试在所述可用频点对应的小区上驻留。
基于上述方案，所述扫频单元，配置为从频段起点开始扫频，直到获得所述可用频点，记录所述可用频点中的起始频点；所述用户设备还包括：小区搜索单元，配置为在所述起始频点上进行小区搜索；所述驻留单元，还用于尝试在搜索到的小区上驻留。
基于上述方案，所述控制单元，配置为当在所述相邻小区或所述可用频点对应的小区上驻留成功时，获得所述第一定时器的定时状态；当所述定时状态表明所述第一定时器未超时时，关闭所述第一定时器。
基于上述方案，所述控制单元，配置为当所述用户设备检测到链路失步时，开启第二定时器，等待所述链路恢复同步；当所述第二定时器超时时，开启所述第一定时器。
第三方面，本发明实施例还提供一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于第一方面所述方法的至少其中之一。
本发明实施例所提供的选择小区的方法及用户设备和计算机存储介质，当UE在开启第一定时器之后，确定是否预先存储有相邻小区的邻区信息，若有，则根据该邻区信息，控制UE尝试在相邻小区上驻留，当在相邻小区上驻留成功，且第一定时器未超时时，关闭第一定时器；若否，则发起扫频，获得预设数目的可用频点，并尝试在可用频点对应的小区上驻留，当在可用频点对应的小区上驻留成功，且第一定时器未超时时，关闭第一定时器。如此，UE进行重建流程中的小区选择时，可以不用进行全频段扫描，而是优先选择相邻小区进行驻留，这样，对于支持的频段较多的UE来说，大大缩短了其选择小区所耗费的时间，使得UE在第一定时器，如T311定时器超时之前，能够快速的选择并驻留在合适的小区上。而如果UE中没有预先存储相邻小区的邻区信息或者在相邻小区上驻留失败的话，则从频段起点开始，搜索预设数目的可用频点，这样相当于牺牲最优化信号质量，来换取选择小区的实时性。通过上述两种方式降低了超时导致重建失败的风险，有效地解决了现有技术中存在的支持的频段较多的UE重建容易失败的技术问题，提高支持的频段较多的UE重建的可靠性，使得业务能够快速恢复，大幅提升用户体验。
附图说明
图1为本发明实施例提供的选择小区方法的流程示意图；
图2为本发明实施例提供的重建流程的示意图；
图3为本发明实施例中提供的用户设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。
本发明实施例提供一种选择小区的方法，该方法应用于UE上，该UE可以为智能手机、平板电脑、智能电视或多媒体播放器等设备。
图1为本发明实施例中选择小区方法的流程示意图，参考图1所示，该方法包括：
S101：开启第一定时器；
在实际应用中，S101可以包括：当UE检测到链路失步时，开启第二定时器，等待链路同步；当第二定时器超时时，开启第一定时器。
在本实施例中，第一定时器可以为LTE系统中的T311定时器，第二定时器可以为LTE系统中的T310定时器。
具体来说，当UE在当前所处的小区上处于连接态，并进行数据业务时，PHY检测到链路失步，上报给RRC，此时，RRC开启第二定时器，并等待链路恢复同步。因为当链路恢复同步时，RRC会关闭第二定时器，所以，当第二定时器超时时，就说明链路未能恢复同步，UE开启第一定时器，同时进行如挂起上述数据业务的无线承载(RB，Radio Bear)、复位介质访问控制层(MAC，Media Access Control)配置等操作，准备发起重建流程，
S102：确定用户设备中是否预先存储有相邻小区的邻区信息；
具体来说，UE在开启第一定时器之后，可以通过在存储单元中查询，或者查找测量报告等方式，来确定其中是否预先存储有邻区信息。这里所说的邻区信息可以为相邻小区的广播控制信道(BCCH，Broadcast Control CHannel)载频频点、相邻小区的小区ID等信息，
S103：若确定存储有邻区信息，根据邻区信息，尝试在相邻小区上进行驻留；
具体来说，当UE确定预先存储有邻区信息时，UE根据该信息，尝试在相邻小区上驻留。通常，UE能够很快驻留在相邻小区上，那么，在驻留成功后，UE就能快速地完成重建过程，使得数据业务快速恢复。
S104：若确定未存储有邻区信息，发起扫频，获得预设数目的可用频点，并尝试在可用频点对应的小区上驻留。
具体来说，S104可以为：从频段起点开始进行扫频，直到获得预设数目的可用频点，并记录可用频点中的起始频点；在起始频点上进行小区搜索，并尝试在搜索到的小区上进行驻留。
需要说明的是，这里所说的频段起点为UE所支持的多个频段的起点，可以为这些频段中频率值较低的频段，也可以为这些频段中频率值较高的频段，本发明不做具体限定。
上述预设数目的可用频点可以为1个、2个、10个、50个等等，以实际UE情况而定，尽可能的在时延和小区质量之间选择一个折中的取值，如果希望时延最短就将预设数目设置成1。
举例来说，预设数目取5，那么，UE从频段起点开始扫频，直到扫到5个可用频点，扫频结束。这5个可用频点为：频点a、频点b、频点c、频点d、频点e，进一步，UE记录这5个频点中频率值最小的频点a，也就是起始频点。当然，起始频点也可以取上述5个频点中频率值最大的频点e，还可以取信号强度最强的频点作为起始频点，本发明不做具体限定。
接下来，UE在记录了起始频点之后，UE在起始频点上进行小区搜索，对搜索到的小区进行测量，并根据测量结果，对该小区进行驻留条件判断，若驻留条件满足，UE则驻留在该小区上，若驻留条件不满足，UE则继续搜索下一个小区。
假设，当UE收到所尝试驻留小区的小区参考信号接收功率(RSRP，Reference Signal Received Power)后，根据以下条件判断该小区是否适合驻留。
1)该小区属于非接入层选择的公共陆地移动网络(PLMN，Public Land Mobile Network)、注册的PLMN或通用SIM卡中保存的等效的PLMN列表中 的一个PLMN；
2)该小区不是被禁止的小区；
3)该小区所属的追踪区域(TA，Tracking Area)不属于小区所属PLMN的禁止TA列表中的任何一个；
4)该小区满足S准则。
只有上述4个条件都满足时，该小区才满足正常驻留条件，UE才能驻留到这样的小区上，才能获得正常的服务。
在具体实施过程中，如果UE没有扫描到可用频点的话，就关闭第一定时器，流程结束，UE回到空闲态，数据业务终止。
在另一实施例中，UE通过S103在相邻小区上驻留可能会因为驻留条件不满足而驻留失败，此时，该方法还可以包括：当在相邻小区上驻留失败时，发起扫频，获得可用频点，尝试在可用频点对应的小区上驻留。也就是说，当UE在相邻小区驻留失败后，还可以通过扫频来获得预设数目的可用频点，并进一步的进行小区搜索，尝试驻留，这样，相当于牺牲了最优化信号质量，来换取选择小区的实时性。
S105：当在相邻小区或可用频点对应的小区上驻留成功，且第一定时器未超时时，关闭第一定时器。
具体来说，由于UE必须在第一定时器超时前在选择的小区上驻留成功，所以，当UE在相邻小区或可用频点对应的小区上驻留成功时，UE需要判断第一定时器，也就是T311定时器是否超时，UE可以获得第一定时器的定时状态，比如，获得T311定时器的当前数值，若该数值为0，就确定T311定时器超时，若该数字非0，就确定T311定时器未超时。那么，当确定第一定时器未超时时，关闭第一定时器。而当确定出第一定时器超时，则释放资源，流程结束，UE回到空闲态，数据业务终止。
至此，UE就完成了小区选择的过程，UE可以开启第三定时器，如LTE 系统中的T301定时器，并在其所驻留的小区上向网络侧发送重建请求，网络侧收到重建请求之后，向UE发送重建应答，UE接收来自网络侧的重建应答，同时关闭第三定时器，并进行相关配置，然后，向网络侧回复重建完成消息，至此，UE重建成功，网络侧重配业务资源后，UE即可继续进行业务。
下面具体描述采用上述一个或者多个实施例所述的选择小区的方法进行重建的流程。
图2为本发明实施例中重建流程的示意图，参考图2所示，重建流程为：
S201：UE在处于连接态、并进行一数据业务时，PHY检测到链路失步，并上报RRC；
S202：RRC开启T310定时器，等待链路恢复同步；
S203：T310定时器超时，RRC开启T311定时器；
S204：RRC确定是否预先存储有相邻小区的邻区信息；若确定存储有邻区信息，跳至S205；若确定未存储有邻区信息，跳至S207；
S205：RRC根据邻区信息，尝试在相邻小区上驻留；若驻留成功，跳至S206；若驻留不成功，跳至S207；
S206：RRC获取T311定时器的定时状态，以确定T311定时器是否超时；若超时，释放资源，UE回到空闲态，流程结束；若未超时，跳至S210；
S207：RRC从频段起点开始，根据预设数目N，发起扫频；若找到可用频点，跳至S208；若没有找到可用频点，关闭T311定时器，UE回到空闲态，业务终止，流程结束；
S208：RRC找到N个可用频点，终止扫频，并记录新的起始频点；
S209：RRC在起始频点上进行小区搜索，并在搜索到的小区上尝试驻留；若驻留成功，跳至S206；若驻留不成功，跳至S207；
S210：RRC关闭T311定时器，在驻留的小区上向网络侧发起重建请求；
S211：RRC收到网络侧发送的重建应答，进行相关配置；
S212：RRC向网络侧回复重建完成消息，恢复业务，流程结束。
由上述可知，UE在失步后的搜索小区的过程中，优选相邻小区进行驻留，UE如果预先存储有相邻小区的邻区信息，则可以迅速的驻留上去，这种方式时延较小；而如果UE中没有预先存储相邻小区的邻区信息或者在相邻小区上驻留失败的话，则从频段起点开始，搜索预设数目的可用频点，这样相当于牺牲最优化信号质量，来换取选择小区的实时性。那么，通过上述两种选择小区的方法可以降低重建延迟，从而降低了由于超时而导致重建失败的风险，有效地解决了现有技术中存在的支持的频段较多的UE重建容易失败的技术问题，提高支持的频段较多的UE重建的可靠性，使得业务能够快速恢复，大幅提升用户体验。
基于同一发明构思，本发明实施例提供一种用户设备，图3为本发明实施例中用户设备的结构示意图，参考图3所示，该用户设备包括：控制单元31、确定单元32、扫频单元33及驻留单元34；
其中，控制单元31，配置为开启第一定时器；还配置为当在相邻小区或可用频点对应的小区上驻留成功，且第一定时器未超时时，关闭第一定时器；确定单元32，配置为确定用户设备中是否预先存储有相邻小区的邻区信息；扫频单元33，配置为若确定未存储有邻区信息，发起扫频，获得可用频点；驻留单元34，配置为若确定存储有邻区信息，根据邻区信息，尝试在相邻小区上驻留；还配置为尝试在可用频点对应的小区上驻留。
基于上述方案，驻留单元34，还配置为当在相邻小区上驻留失败时，发起扫频，获得可用频点，尝试在可用频点对应的小区上驻留。
基于上述方案，扫频单元33，配置为从频段起点开始扫频，直到获得可用频点，记录可用频点中的起始频点；用户设备还包括：小区搜索单元， 配置为在起始频点上进行小区搜索；驻留单元34，还用于尝试在搜索到的小区上驻留。
基于上述方案，控制单元31，配置为当在相邻小区或可用频点对应的小区上驻留成功时，获得第一定时器的定时状态；当定时状态表明第一定时器未超时时，关闭第一定时器。
基于上述方案，控制单元31，配置为当用户设备检测到链路失步时，开启第二定时器，等待链路恢复同步；当第二定时器超时时，开启第一定时器。
以上所述的控制单元31、确定单元32、扫频单元33、驻留单元34及小区搜索单元均可以位于用户设备的处理器中，而各个定时器则可以位于用户设备的处理器中，也可以位于与处理器相连的定时器芯片中，用户设备还包括一存储器，配置为存储相邻小区的邻区信息。
这里所述处理器可为用户设备中的由移动终端中的应用处理器AP(AP，Application Processor)、中央处理器(CPU，Central Processing Unit)、数字信号处理器(DSP，Digital Signal Processor)或可编程门阵列(FPGA，Field Programmable Gate Array)。
本发明实施例还提供一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行本实施例所述方法的至少其中之一，如图1所述的方法。
所述存储介质可为ROM、RAM、移动硬盘、Flash、光盘、DVD或移动硬盘等存储介质，在一些实施例中所述存储介质可为非瞬间存储介质。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘 存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。

Claims (11)

  1. 一种选择小区的方法，所述方法包括：
    开启第一定时器；
    确定用户设备中是否预先存储有相邻小区的邻区信息；
    若确定存储有所述邻区信息，根据所述邻区信息，尝试在所述相邻小区上驻留；
    若确定未存储有所述邻区信息，发起扫频，获得预设数目的可用频点，并尝试在所述可用频点对应的小区上驻留；
    当在所述相邻小区或所述可用频点对应的小区上驻留成功，且所述第一定时器未超时时，关闭所述第一定时器。
  2. 根据权利要求1所述的方法，其中，在所述尝试在所述相邻小区上驻留之后，所述方法还包括：
    当在所述相邻小区上驻留失败时，发起扫频，获得所述可用频点，并尝试在所述可用频点对应的小区上驻留。
  3. 根据权利要求1或2所述的方法，其中，所述发起扫频，获得预设数目的可用频点，并尝试在所述可用频点对应的小区上驻留，包括：
    从频段起点开始扫频，直到获得所述可用频点，记录所述可用频点中的起始频点；
    在所述起始频点上进行小区搜索，尝试在搜索到的小区上驻留。
  4. 根据权利要求1所述的方法，其中，所述当在所述相邻小区或所述可用频点对应的小区上驻留成功，且所述第一定时器未超时时，关闭所述第一定时器，包括：
    当在所述相邻小区或所述可用频点对应的小区上驻留成功时，获得所述第一定时器的定时状态；
    当所述定时状态表明所述第一定时器未超时时，关闭所述第一定时器。
  5. 根据权利要求1所述的方法，其中，所述开启第一定时器，包括：
    当所述用户设备检测到链路失步时，开启第二定时器，等待所述链路恢复同步；
    当所述第二定时器超时时，开启所述第一定时器。
  6. 一种用户设备，所述用户设备包括：控制单元、确定单元、扫频单元及驻留单元；
    其中，所述控制单元，配置为开启第一定时器；还配置为当在相邻小区或预设数目的可用频点对应的小区上驻留成功，且所述第一定时器未超时时，关闭所述第一定时器；
    所述确定单元，配置为确定所述用户设备中是否预先存储有所述相邻小区的邻区信息；
    所述扫频单元，配置为若确定未存储有所述邻区信息，发起扫频，获得所述可用频点；
    所述驻留单元，配置为若确定存储有所述邻区信息，根据所述邻区信息，尝试在所述相邻小区上驻留；还配置为尝试在所述可用频点对应的小区上驻留。
  7. 根据权利要求6所述的用户设备，其中，所述驻留单元，还配置为当在所述相邻小区上驻留失败时，发起扫频，获得所述可用频点，并尝试在所述可用频点对应的小区上驻留。
  8. 如权利要求6或7所述的用户设备，其中，所述扫频单元，配置为从频段起点开始扫频，直到获得所述可用频点，记录所述可用频点中的起始频点；所述用户设备还包括：小区搜索单元，配置为在所述起始频点上进行小区搜索；
    所述驻留单元，还配置为尝试在搜索到的小区上驻留。
  9. 根据权利要求6所述的用户设备，其中，所述控制单元，配置为当在所述相邻小区或所述可用频点对应的小区上驻留成功时，获得所述第一定时器的定时状态；当所述定时状态表明所述第一定时器未超时时，关闭所述第一定时器。
  10. 根据权利要求6所述的用户设备，其中，所述控制单元，配置为当所述用户设备检测到链路失步时，开启第二定时器，等待所述链路恢复同步；当所述第二定时器超时时，开启所述第一定时器。
  11. 一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求1至5所述方法的至少其中之一。
PCT/CN2014/091038 2014-05-22 2014-11-13 一种选择小区的方法及用户设备和计算机存储介质 WO2015176504A1 (zh)

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